CN103412218A - Detection circuit for working condition of ceramic heater strip and corresponding method - Google Patents

Detection circuit for working condition of ceramic heater strip and corresponding method Download PDF

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Publication number
CN103412218A
CN103412218A CN2013103480449A CN201310348044A CN103412218A CN 103412218 A CN103412218 A CN 103412218A CN 2013103480449 A CN2013103480449 A CN 2013103480449A CN 201310348044 A CN201310348044 A CN 201310348044A CN 103412218 A CN103412218 A CN 103412218A
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module
ceramic heat
heater strip
resistance
testing circuit
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CN2013103480449A
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张雪松
华同曙
宋长加
金蕊
杨慧斌
孙峰
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Changzhou University
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Changzhou University
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Abstract

The invention discloses a detection circuit for the working condition of a ceramic heater strip and a corresponding method, and belongs to the field of working state detection of ceramic heater strips. The detection circuit for the working condition of the ceramic heater strip comprises a control module, an electronic switch module, a heater strip driving module, a heater strip protecting module, a detection processing module and a voltage conversion module. The detection circuit for the working condition of the ceramic heater strip is used in cooperation with the detection method, the resistance characteristic of the ceramic heater strip is used, the problem of high current of the detection circuit is solved, and the purpose of detection is achieved. The control module is used for sending out a detection signal and a control signal in a time-share mode to judge the working state of the ceramic heater strip. Due to the fact that the characteristics of the heater strip are made full use of to form the detection circuit, the detection circuit is simple and reliable, and accuracy of detection is improved.

Description

A kind of ceramic heat silk operating mode testing circuit and correlation method
Technical field
The invention belongs to ceramic heat silk detection technique field, be specifically related to a kind of method that ceramic heat silk operating mode testing circuit and operating mode thereof detect.
Background technology
In the Vehicular liquid well heater, heater strip is generally made by the metallic resistance silk, but is subjected to himself properties influence, and the heating-up temperature of heater strip can't reach enough height usually, and easily is corroded.Nowadays in some Vehicular liquid well heaters, bring into use heat up rapid, high, the corrosion resistant ceramic heat silk of surface temperature.But in the course of work of ceramic heat silk, in (1) Vehicular liquid well heater, use the ceramic heat silk, this heater strip self-resistance value is less, so the electric current that testing circuit bears is larger.(2) in the use, some unexpected situations may occur, a series of situations that system can't be worked such as ceramic heat silk open circuit, short circuit during as system works, the appearance of these faults gently makes well heater directly quit work, heavy cause the permanent damages of equipment, and may cause some large security incidents.Therefore overcome detection difficult, invent a kind of testing circuit of accurate real-time judge ceramic heat silk operating mode, very important for the safety of the equipment of assurance.
Summary of the invention
The purpose of the embodiment of the present invention is the problem for above-mentioned existence, and the Working condition detecting method of a kind of ceramic heat silk industrial and mineral testing circuit and this heater strip is provided, and solves the accurate test problems of each operating mode of ceramic heat silk.
The technical scheme of the embodiment of the present invention is achieved in that the purpose of the embodiment of the present invention has been to provide a kind of testing circuit of direct current generator, comprise: electronic switch module, the input end of described electronic switch module is connected to the control wave output terminal of described control module, and the output terminal of described electronic switch module is connected to the signal input part of described heater strip driver module; The heater strip driver module, the power input of described heater strip driver module is connected to the positive source of described testing circuit, and described heater strip driver module circuit power output terminal is connected to described heater strip protection module; The heater strip protection module, described heater strip protection module input end is connected to the feedback signal input end A of described Check processing module; The Check processing module, the detection signal input end B of described Check processing module is connected to the detection signal output terminal of described control module, and the detection signal output terminal C of described Check processing module is connected to the feedback voltage input end of described voltage transformation module; Voltage transformation module, the output terminal of described voltage transformation module connect into the feedback signal input end of described control module.
The electronic switch module circuit is by triode Q 1, capacitor C 4, resistance R 5And R 6Form; Resistance R 5Be connected to described control module control signal output terminal and triode Q 1Base stage, realize triode Q 1Base stage is carried out the effect of current limliting; Capacitor C 4Be connected to described triode Q 1Base stage and resistance R 5Between; Resistance R 6Be connected to positive pole and the triode Q of testing circuit power supply 1Collector between, realize the current-limiting protection effect to collector.
Heater strip driver module circuit comprises: automatically protect power MOSFET power supply driver Q 2, resistance R 7, diode D 2And capacitor C 1Resistance R 7Be connected to signal output part and the described power MOSFET power supply driver Q of described electronic switch module circuit 2Grid between, realize weakening or the problems of Signal Integrity such as erasure signal overshoot; Capacitor C 1Be connected to described power MOSFET power supply driver Q 2Drain electrode and the power supply stratum of described testing circuit between; Power MOSFET power supply driver Q 2Drain electrode be connected to the positive source of testing circuit, power MOSFET power supply driver Q 2Source electrode be connected to described diode D 2The P utmost point; In testing circuit, utilize diode D 2The unilateal conduction characteristic, the detection electric current while preventing from detecting pours in down a chimney into described power MOSFET power supply driver Q 2Source electrode, thereby play the effect of protection device safety.
Heater strip protection module circuit comprises: ceramic heat silk R GP, capacitor C 3, fuse F 1And transient suppressor D 1Capacitor C 3And diode D 1Be connected to described diode D 2The N utmost point and the power supply stratum of described testing circuit between; Fuse F 1Be connected to described ceramic heat silk R GPWith the power supply stratum of described testing circuit, be connected, to described ceramic heat silk R GPPlay overcurrent protection.
The Check processing modular circuit comprises: resistance R 1, resistance R 2,, resistance R 3, resistance R 4, capacitor C 2And diode D 3Resistance R 1Be connected to feedback signal input end A and the described resistance R of described Check processing modular circuit 2Between; Resistance R 2The other end and described diode D 3N extremely directly be connected; Diode D 3The P utmost point be connected to the detection signal input end B place of described Check processing module; Diode D 3For stoping ceramic heat silk drive current to pour in down a chimney into described control module circuit, and cause described control module fault; Resistance R 4The other end connects and is connected with the power supply ground of described testing circuit.
The voltage transformation module circuit comprises: analog/digital converter U 5Analog/digital converter U 5Input end be connected to the detection signal output terminal C place of described Check processing module, analog/digital converter U 5Output terminal be connected to the feedback signal input end of described control module.
The purpose of the embodiment of the present invention also is to provide a kind of ceramic heat silk Working condition detecting method, and the Working condition detecting method of ceramic heat silk coordinates ceramic heat silk testing circuit to detect the various operating modes of heater strip.The detection method of ceramic heat silk comprises the following steps:
S1: before starting that the various operating modes of ceramic heat silk are carried out to state-detection, the present steering order of first record controls module;
S2: judge that whether the control module instruction is for opening the work of ceramic heat silk;
S3: if the feedback signal input end of control module directly reads the data of voltage transformation module output terminal;
S4: if not, the detection signal delivery outlet of control module sends detection signal, and rear feedback signal input port reads the data of voltage transformation module output terminal;
S5: the heater strip detection signal that turn-offs the detection signal output terminal of control module in ceramic heat silk testing circuit;
S6: receive the voltage data of voltage transformation module output according to control module, directly judge the various operating modes of ceramic heat silk;
S7: according to the duty of the ceramic heat silk of judging, control module is taked corresponding handling procedure, guarantees normal operation and the safety of system.
The accompanying drawing explanation
Fig. 1 is the modular structure schematic diagram of the ceramic heat silk industrial and mineral testing circuit that provides of the embodiment of the present invention;
Fig. 2 is the circuit diagram of the ceramic heat silk industrial and mineral testing circuit that provides of the embodiment of the present invention;
The overhaul flow chart of the ceramic heat silk industrial and mineral detection method that Fig. 3 table embodiment of the present invention provides.
Embodiment
For content of the present invention, purpose and technical scheme more easily are expressly understood, below in conjunction with drawings and Examples, the present invention is further detailed explanation.
As shown in Figure 1; the technical scheme of the embodiment of the present invention is: a kind of ceramic heat silk operating mode testing circuit comprises: control module 1., electronic switch module 2., the heater strip driver module 3., the heater strip protection module 4., the Check processing module 5., voltage transformation module 6..2., described electronic switch module input end 2. is connected to described control module control wave output terminal 1. to electronic switch module, and the output terminal of described electronic switch module is connected to described heater strip driver module signal input part 3.; 3., described heater strip driver module power input 3. is connected to the positive source of described testing circuit to the heater strip driver module, and 4. described heater strip driver module 3. circuit power output terminal is connected to described heater strip protection module; 4., described heater strip protection module 4. input end is connected to described Check processing module feedback signal input end A 5. to the heater strip protection module; The Check processing module 5., described Check processing module detection signal input end B 5. is connected to described control module detection signal output terminal 1., and described Check processing module detection signal output terminal C 5. is connected to described voltage transformation module feedback voltage input end 6.; 6., described voltage transformation module output terminal 6. connects into described control module feedback signal input end 1. to voltage transformation module.
Figure 2 shows that a kind of circuit diagram of the ceramic heat formula industrial and mineral testing circuit that the embodiment of the present invention provides, the physical circuit of its industrial and mineral testing circuit connects as described below.
Electronic switch module 2. circuit by triode Q 1, capacitor C 4, resistance R 5And R 6Form; Resistance R 5Be connected to control module 1. control signal output terminal and triode Q 1Base stage, realize triode Q 1Base stage is carried out the effect of current limliting; Capacitor C 4Be connected to triode Q 1Base stage and resistance R 5Between; Resistance R 6Be connected to positive pole and the triode Q of testing circuit power supply 1Collector between, realize the current-limiting protection effect to collector.
Heater strip driver module 3. circuit comprises: automatically protect power MOSFET power supply driver Q 2, resistance R 7, diode D 2And capacitor C 1Resistance R 7Be connected to electronic switch module 2. signal output part and the power MOSFET power supply driver Q of circuit 2Grid between, realize weakening or the problems of Signal Integrity such as erasure signal overshoot; Capacitor C 1Be connected to power MOSFET power supply driver Q 2Drain electrode and the power supply stratum of testing circuit between; Power MOSFET power supply driver Q 2Drain electrode be connected to the positive source of testing circuit, power MOSFET power supply driver Q 2Source electrode be connected to diode D 2The P utmost point; In testing circuit, utilize diode D 2The unilateal conduction characteristic, the detection electric current while preventing from detecting pours in down a chimney into described power MOSFET power supply driver Q 2Source electrode, thereby play the effect of protection device safety.
Heater strip protection module 4. circuit comprises: ceramic heat silk R GP, capacitor C 3, fuse F 1And transient suppressor D 1Capacitor C 3And diode D 1Be connected to diode D 2The N utmost point and the power supply stratum of described testing circuit between; Fuse F 1Be connected to ceramic heat silk R GPWith the power supply stratum of testing circuit, be connected, to ceramic heat silk R GPPlay overcurrent protection.
Check processing module 5. circuit comprises: resistance R 1, resistance R 2,, resistance R 3, resistance R 4, capacitor C 2And diode D 3Resistance R 1Be connected to feedback signal input end A and the resistance R of Check processing modular circuit 2Between; Resistance R 2The other end and diode D 3N extremely directly be connected; Diode D 3The P utmost point be connected to Check processing module detection signal input end B place 5.; Diode D 3For stoping ceramic heat silk drive current to pour in down a chimney into 1. circuit of control module, and cause 1. fault of described control module; Resistance R 4The other end connects and is connected with the power supply ground of testing circuit.
Voltage transformation module 6. circuit comprises: analog/digital converter U 5Analog/digital converter U 5Input end be connected to Check processing module detection signal output terminal C place 5., analog/digital converter U 5Output terminal be connected to control module feedback signal input end 1..
Figure 3 shows that the ceramic heat silk Working condition detecting method process flow diagram of the embodiment of the present invention, the ceramic heat yarn examination method coordinates its operating mode testing circuit to detect the various operating modes of heater strip.Ceramic heat silk Working condition detecting method comprises the following steps:
S1: before starting that the various operating modes of ceramic heat silk are carried out to state-detection, first record controls module is present steering order 1.;
S2: judge control module 1. instruction whether for opening the work of ceramic heat silk;
S3: if control module feedback signal input end 1. directly reads the 6. data of output terminal of voltage transformation module;
S4: if not, control module detection signal delivery outlet 1. sends detection signal, and rear feedback signal input port reads the 6. data of output terminal of voltage transformation module;
S5: the heater strip detection signal that turn-offs control module detection signal output terminal 1. in ceramic heat silk testing circuit;
S6: 1. receive according to control module the voltage data that 6. voltage transformation module is exported, directly judge the various operating modes of ceramic heat silk;
The different states that detect corresponding motor under voltage of table 1
Figure BDA00003642112400051
Wherein: V CC1: control module is the detection signal voltage of detection signal output terminal output 1.;
V D2: diode D 2Forward conduction voltage drop;
V D3: diode D 3Forward conduction voltage drop.
S7: according to the duty of the ceramic heat silk of judging, control module is taked corresponding handling procedure, guarantees normal operation and the safety of system.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only preferred embodiment of the present invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (7)

1. ceramic heat silk operating mode testing circuit, comprise: electronic switch module, the input end of described electronic switch module is connected to the control wave output terminal of described control module, and the output terminal of described electronic switch module is connected to the signal input part of described heater strip driver module; The heater strip driver module, the power input of described heater strip driver module is connected to the positive source of described testing circuit, and described heater strip driver module circuit power output terminal is connected to described heater strip protection module; The heater strip protection module, described heater strip protection module input end is connected to the feedback signal input end A of described Check processing module; The Check processing module, the detection signal input end B of described Check processing module is connected to the detection signal output terminal of described control module, and the detection signal output terminal C of described Check processing module is connected to the feedback voltage input end of described voltage transformation module; Voltage transformation module, the output terminal of described voltage transformation module connect into the feedback signal input end of described control module.
2. ceramic heat silk operating mode testing circuit as claimed in claim 1, is characterized in that, described electronic switch module circuit is by triode Q 1, capacitor C 4, resistance R 5And R 6Form; Resistance R 5Be connected to described control module control signal output terminal and triode Q 1Base stage, realize triode Q 1Base stage is carried out the effect of current limliting; Capacitor C 4Be connected to described triode Q 1Base stage and resistance R 5Between; Resistance R 6Be connected to positive pole and the triode Q of testing circuit power supply 1Collector between, realize the current-limiting protection effect to collector.
3. ceramic heat silk operating mode testing circuit as claimed in claim 1, is characterized in that, described heater strip driver module circuit comprises: automatically protect power MOSFET power supply driver Q 2, resistance R 7, diode D 2And capacitor C 1Resistance R 7Be connected to signal output part and the described power MOSFET power supply driver Q of described electronic switch module circuit 2Grid between, realize weakening or the problems of Signal Integrity such as erasure signal overshoot; Capacitor C 1Be connected to described power MOSFET power supply driver Q 2Drain electrode and the power supply stratum of described testing circuit between; Power MOSFET power supply driver Q 2Drain electrode be connected to the positive source of testing circuit, power MOSFET power supply driver Q 2Source electrode be connected to described diode D 2The P utmost point; In testing circuit, utilize diode D 2The unilateal conduction characteristic, the detection electric current while preventing from detecting pours in down a chimney into described power MOSFET power supply driver Q 2Source electrode, thereby play the effect of protection device safety.
4. ceramic heat silk operating mode testing circuit as claimed in claim 1, is characterized in that, described heater strip protection module circuit comprises: ceramic heat silk R GP, capacitor C 3, fuse F 1And transient suppressor D 1Capacitor C 3And diode D 1Be connected to described diode D 2The N utmost point and the power supply stratum of described testing circuit between; Fuse F 1Be connected to described ceramic heat silk R GPWith the power supply stratum of described testing circuit, be connected, to described ceramic heat silk R GPPlay overcurrent protection.
5. ceramic heat silk operating mode testing circuit as claimed in claim 1, is characterized in that, described Check processing modular circuit comprises: resistance R 1, resistance R 2,, resistance R 3, resistance R 4, capacitor C 2And diode D 3Resistance R 1Be connected to feedback signal input end A and the described resistance R of described Check processing modular circuit 2Between; Resistance R 2The other end and described diode D 3N extremely directly be connected; Diode D 3The P utmost point be connected to the detection signal input end B place of described Check processing module; Diode D 3For stoping ceramic heat silk drive current to pour in down a chimney into described control module circuit, and cause described control module fault; Resistance R 4The other end connects and is connected with the power supply ground of described testing circuit.
6. ceramic heat silk operating mode testing circuit as claimed in claim 1, is characterized in that, described voltage transformation module circuit comprises: analog/digital converter U 5Analog/digital converter U 5Input end be connected to the detection signal output terminal C place of described Check processing module, analog/digital converter U 5Output terminal be connected to the feedback signal input end of described control module.
7. a ceramic heat silk Working condition detecting method, is characterized in that, ceramic heat silk Working condition detecting method coordinates ceramic heat silk operating mode testing circuit to detect the various operating modes of ceramic heat silk.The ceramic heat yarn examination method comprises the following steps:
S1: before starting that the various operating modes of ceramic heat silk are carried out to state-detection, the present steering order of first record controls module;
S2: judge that whether the control module instruction is for opening the work of ceramic heat silk;
S3: if the feedback signal input end of control module directly reads the data of voltage transformation module output terminal;
S4: if not, the detection signal delivery outlet of control module sends detection signal, and rear feedback signal input port reads the data of voltage transformation module output terminal;
S5: the heater strip detection signal that turn-offs the detection signal output terminal of control module in ceramic heat silk testing circuit;
S6: receive the voltage data of voltage transformation module output according to control module, directly judge the various operating modes of ceramic heat silk;
S7: according to the duty of the ceramic heat silk of judging, control module is taked corresponding handling procedure, guarantees normal operation and the safety of system.
CN2013103480449A 2013-08-09 2013-08-09 Detection circuit for working condition of ceramic heater strip and corresponding method Pending CN103412218A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106646086A (en) * 2017-02-25 2017-05-10 郑州畅威物联网科技有限公司 Detection method for wire breaking of heating wire of semiconductor gas sensor
CN110994561A (en) * 2019-04-30 2020-04-10 宁德时代新能源科技股份有限公司 Battery safety protection system and processing method
CN113687269A (en) * 2021-09-23 2021-11-23 Tcl家用电器（合肥）有限公司 Heating pipe monitoring circuit and monitoring method thereof and washing machine
CN114264696A (en) * 2022-03-02 2022-04-01 中国长江三峡集团有限公司 Earth heat flow measuring device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62277567A (en) * 1986-05-27 1987-12-02 Fuji Electric Co Ltd Detecting method for temperature abnormality
CN200976032Y (en) * 2006-10-31 2007-11-14 比亚迪股份有限公司 Malfunction detection device for resistance wire of heating stove
CN201104270Y (en) * 2007-04-26 2008-08-20 海尔集团公司 Simple electrical heating wire testing apparatus
CN201196746Y (en) * 2008-03-31 2009-02-18 上海电气自动化设计研究所有限公司 Heating temperature control device of device aging screening vehicle
CN202305689U (en) * 2011-09-30 2012-07-04 海信（北京）电器有限公司 Multiway heating wire detection circuit and refrigerator provided with same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62277567A (en) * 1986-05-27 1987-12-02 Fuji Electric Co Ltd Detecting method for temperature abnormality
CN200976032Y (en) * 2006-10-31 2007-11-14 比亚迪股份有限公司 Malfunction detection device for resistance wire of heating stove
CN201104270Y (en) * 2007-04-26 2008-08-20 海尔集团公司 Simple electrical heating wire testing apparatus
CN201196746Y (en) * 2008-03-31 2009-02-18 上海电气自动化设计研究所有限公司 Heating temperature control device of device aging screening vehicle
CN202305689U (en) * 2011-09-30 2012-07-04 海信（北京）电器有限公司 Multiway heating wire detection circuit and refrigerator provided with same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106646086A (en) * 2017-02-25 2017-05-10 郑州畅威物联网科技有限公司 Detection method for wire breaking of heating wire of semiconductor gas sensor
CN110994561A (en) * 2019-04-30 2020-04-10 宁德时代新能源科技股份有限公司 Battery safety protection system and processing method
CN113687269A (en) * 2021-09-23 2021-11-23 Tcl家用电器（合肥）有限公司 Heating pipe monitoring circuit and monitoring method thereof and washing machine
CN114264696A (en) * 2022-03-02 2022-04-01 中国长江三峡集团有限公司 Earth heat flow measuring device

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Application publication date: 20131127